
Rev. 0.5 10/09
Copyright 2009 by Silicon Laboratories
Si5338
I 2C-P ROGRAMMABLE A NY-R ATE, A NY-O UTPUT Q UAD C LOCK G ENERATOR
Features
Applications
Description
The Si5338 is a high performance, low jitter clock generator capable of
synthesizing any frequency on each of the device's four output drivers. The device
is capable of operating in asynchronous mode for replacing free-running crystal
oscillators (XO), or in a synchronous mode for translating any frequency to any
other frequency within its supported frequency range. Using its patented
MultiSynth technology, the Si5338 allows generation of four independent clocks
with 0 ppm precision. Each output clock is independently configurable to support
any of the supported signal format and supply voltages. The Si5338 provides low
jitter frequency synthesis with outstanding frequency flexibility in a space-saving
4 x 4 mm QFN package. The device is programmable via an I2C/SMBus-
compatible serial interface and supports operation from a 1.8, 2.5, or 3.3 V core
supply.
Low power MultiSynth technology
enables independent, any-rate
frequency synthesis on four differential
output drivers
Highly-configurable output drivers
support up to four differential outputs
or eight single-ended clock outputs or
a combination of both
Low phase jitter of 0.7 ps RMS typ
High precision synthesis allows true
zero ppm frequency accuracy on all
outputs
Flexible input reference:
External crystal: 8 to 30 MHz
CMOS input: 5 to 200 MHz
SSTL/HSTL input: 5 to 350 MHz
Differential input: 5 to 710 MHz
Independently configurable outputs
support any frequency or format:
LVPECL/LVDS: 0.16 to 710 MHz
HCSL: 0.16 to 250 MHz
CMOS: 0.16 to 200 MHz
SSTL/HSTL: 0.16 to 350 MHz
Independent output voltage per driver:
1.5, 1.8, 2.5, or 3.3 V
Independent core supply voltage:
1.8, 2.5, 3.3 V
Independent Frequency increment/
decrement feature enables
glitchless frequency adjustments in
1 ppm steps
Independent phase adjustment on
each of the output drivers with an
accuracy of <20 ps steps
Highly configurable spread
spectrum on any output:
Any frequency from 5 to 350 MHz
Any spread from 0.5 to 5.0%
Any modulation rate from 33 to
63 kHz
External feedback mode allows
zero-delay buffer implementation
Loss of lock and loss of signal
alarms
I2C/SMBus compatible interface
Easy to use programming software
Small size: 4 x 4 mm, 24-QFN
Low power: 45 mA core supply typ
Wide temperature range: –40 to
+85 °C
Gigabit Ethernet
PCI Express 2.0
OC-3/12, SFI-5
Processor, memory clocking
Broadcast video
xDSL
PON
T1/E1
Ordering Information:
Pin Assignments
IN1
CLK2B
CLK2A
VDDO2
VDDO1
CLK1B
CLK1A
VDD
SCL
CLK
3
A
CL
K3B
INTR
SD
A
VD
D
O
0
CL
K
0
B
CL
K0A
RS
V
D_
G
N
D
VDD
O
3
GND
IN2
IN3
IN4
IN5
IN6
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